Ligand-modulated electron transfer rates from CsPbBr3 nanocrystals to titanium dioxide

Nanophotonics

Zhao Haifeng¹  Li Faming¹  Zeng Peng¹  Liu Mingzhen¹  Ren Xinjian¹  Liu Xiaochun¹  Wei Linfeng¹  Zhang Xinyang¹ 

[1] School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu611731, P. R. China;

关键词: bridge-barrier effect;    cspbbr3 nanocrystals;    electron transfer;    ligand-bridge;   

DOI  :  10.1515/nanoph-2020-0631

来源: DOAJ

【 摘 要 】

In most perovskite nanocrystal (PeNC)-based optoelectronic and photonic applications, surface ligands inevitably lead to a donor–bridge–acceptor charge transfer configuration. In this article, we demonstrate successful modulation of electron transfer (ET) rates from all-inorganic CsPbBr3 PeNCs to mesoporous titanium dioxide films, by using different surface ligands including single alkyl chain oleic acid and oleylamine, cross-linked insulating (3-aminopropyl)triethoxysilane and aromatic naphthoic acid molecules as the ligand-bridge. We systematically investigated the ET process through time-resolved photoluminescence spectroscopy. Calculations verified the ligand-bridge barrier effect of the three species upon the ET process. Transient absorption measurements excluded carrier-delocalization effect of the naphthoic acid ligands and confirmed the bridge-barrier effect. Our work provides a perspective for composable and appropriate ligands design for diverse practical purposes.

【 授权许可】

Unknown